Support static method references

#KT-5123 Fixed

compiler/testData/codegen/boxWithStdlib/callableReference/function/enumValueOfMethod.kt

@@ -0,0 +1,9 @@
+enum class E {
+    ENTRY
+}
+
+fun box(): String {
+    val f = E::valueOf
+    val result = f("ENTRY")
+    return if (result == E.ENTRY) "OK" else "Fail $result"
+}